Isotopic systematics of zircon indicate an African affinity for the rocks of southernmost India

Abstract Southern India lies in an area of Gondwana where multiple blocks are juxtaposed along Moho-penetrating structures, the significance of which are not well understood. Adequate geochronological data that can be used to differentiate the various blocks are also lacking. We present a newly acqu...

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Autores principales:	Chris Clark, Alan S. Collins, Richard J. M. Taylor, Martin Hand
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6bdd1dac544a4e0392e352e9d03fbb56
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spelling	oai:doaj.org-article:6bdd1dac544a4e0392e352e9d03fbb562021-12-02T17:04:36ZIsotopic systematics of zircon indicate an African affinity for the rocks of southernmost India10.1038/s41598-020-62075-y2045-2322https://doaj.org/article/6bdd1dac544a4e0392e352e9d03fbb562020-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-62075-yhttps://doaj.org/toc/2045-2322Abstract Southern India lies in an area of Gondwana where multiple blocks are juxtaposed along Moho-penetrating structures, the significance of which are not well understood. Adequate geochronological data that can be used to differentiate the various blocks are also lacking. We present a newly acquired SIMS U–Pb, Lu–Hf, O isotopic and trace element geochemical dataset from zircon and garnet from the protoliths of the Nagercoil Block at the very tip of southern India. The data indicate that the magmatic protoliths of the rocks in this block formed at c. 2040 Ma with Lu–Hf, O-isotope and trace element data consistent with formation in a magmatic arc environment. The zircon data from Nagercoil Block are isotopically and temporally distinct from those in all the other blocks in southern India, but remarkably correspond to rocks in East Africa that are exposed on the southern margin of the Tanzania–Bangweulu Block. The new data suggest that the tip of southern India has an African affinity and a major suture zone must lie along its northern margin. All of these blocks were finally brought together during the Ediacaran-Cambrian amalgamation of Gondwana where they underwent high to ultrahigh temperature metamorphism.Chris ClarkAlan S. CollinsRichard J. M. TaylorMartin HandNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-12 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chris Clark Alan S. Collins Richard J. M. Taylor Martin Hand Isotopic systematics of zircon indicate an African affinity for the rocks of southernmost India
description	Abstract Southern India lies in an area of Gondwana where multiple blocks are juxtaposed along Moho-penetrating structures, the significance of which are not well understood. Adequate geochronological data that can be used to differentiate the various blocks are also lacking. We present a newly acquired SIMS U–Pb, Lu–Hf, O isotopic and trace element geochemical dataset from zircon and garnet from the protoliths of the Nagercoil Block at the very tip of southern India. The data indicate that the magmatic protoliths of the rocks in this block formed at c. 2040 Ma with Lu–Hf, O-isotope and trace element data consistent with formation in a magmatic arc environment. The zircon data from Nagercoil Block are isotopically and temporally distinct from those in all the other blocks in southern India, but remarkably correspond to rocks in East Africa that are exposed on the southern margin of the Tanzania–Bangweulu Block. The new data suggest that the tip of southern India has an African affinity and a major suture zone must lie along its northern margin. All of these blocks were finally brought together during the Ediacaran-Cambrian amalgamation of Gondwana where they underwent high to ultrahigh temperature metamorphism.
format	article
author	Chris Clark Alan S. Collins Richard J. M. Taylor Martin Hand
author_facet	Chris Clark Alan S. Collins Richard J. M. Taylor Martin Hand
author_sort	Chris Clark
title	Isotopic systematics of zircon indicate an African affinity for the rocks of southernmost India
title_short	Isotopic systematics of zircon indicate an African affinity for the rocks of southernmost India
title_full	Isotopic systematics of zircon indicate an African affinity for the rocks of southernmost India
title_fullStr	Isotopic systematics of zircon indicate an African affinity for the rocks of southernmost India
title_full_unstemmed	Isotopic systematics of zircon indicate an African affinity for the rocks of southernmost India
title_sort	isotopic systematics of zircon indicate an african affinity for the rocks of southernmost india
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/6bdd1dac544a4e0392e352e9d03fbb56
work_keys_str_mv	AT chrisclark isotopicsystematicsofzirconindicateanafricanaffinityfortherocksofsouthernmostindia AT alanscollins isotopicsystematicsofzirconindicateanafricanaffinityfortherocksofsouthernmostindia AT richardjmtaylor isotopicsystematicsofzirconindicateanafricanaffinityfortherocksofsouthernmostindia AT martinhand isotopicsystematicsofzirconindicateanafricanaffinityfortherocksofsouthernmostindia
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Isotopic systematics of zircon indicate an African affinity for the rocks of southernmost India

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